Carolyn sucks so hard in this answer. I fell in love with the LW, by the letter's end, because all she asked was how to change literally the only thing she has a chance of controlling: how do I change my perspective so I do not (a) resent my sister. And Carolyn, who has been much kinder to much worse LWs, started with a quite possibly unwarranted rant against the parents, and turned it into a malicious attack on the LW for being bitchy about the baby, which the LW *wasn't*.